Just got a blue Royal 231 vacuum. Cannot find anything at all about it. It works great and is in awesome condition. Got it from an older gentleman who use to sell them. Curious if anyone has any info.
Post# 304698 , Reply# 1   11/4/2014 at 19:06 (3,454 days old) by KirbyClassicIII(Milwaukie, Oregon)  
Kingston/Saniway/Royals, there were slight variations on a machine designed and built by Kingston co of Bronson Michigan, I have a pink one , model 975 from 1963, if you look at the one you have, you see by this time a combination of all 3, the handle is the same as the Kingston and first Saniway, the lid is still Royal, the Saniways and Kingstons had a hinged lid, the Royals always had side clamps, the switch is Saniway or Kingston, the earlier Royals had a toggle switch, this style canister is one of my all time favorites, great airflow as well as suction, and very quiet.